541
FNCA52 TJSJ 241930
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 PM AST MON AUG 24 2026
DISCUSSION
AROUND MID-MORNING, SURFACE STATIONS SHOWED MINIMUM RH VALUES
NEAR 55% IN GUANICA, BUT VALUES OVERALL REMAINED IN THE UPPER 60S
OR HIGHER ACROSS MOST AREAS OF SOUTHERN PUERTO RICO AND THE U.S.
VIRGIN ISLANDS. AVAILABLE MOISTURE ACROSS THE REGION FROM A
DEPARTING WEAK TROPICAL WAVE AND LOCAL EFFECTS ARE RESULTING IN
AFTERNOON SHOWERS, WHICH ARE KEEPING RH VALUES ABOVE CRITICAL
THRESHOLDS THROUGH THE REMAINDER OF THE AFTERNOON. AS A RESULT,
THE FIRE WEATHER RISK REMAINS LOW FOR THE REST OF TODAY.
IN TERMS OF SURFACE WINDS, A MORE EAST-SOUTHEASTERLY WIND PATTERN
IS FORECAST TO CONTINUE. THE ARRIVAL OF A TROPICAL WAVE TOMORROW,
TUESDAY, WILL REDUCE THE FIRE WEATHER RISK AND KEEP IT LOW.
HOWEVER, STRESSED VEGETATION AND DRY FUELS ARE STILL PRESENT,
PARTICULARLY ACROSS THE SOUTHERN PLAINS AND HILLS OF PUERTO RICO
AND THE U.S. VIRGIN ISLANDS. RESIDENTS AND VISITORS ARE URGED TO
AVOID OUTDOOR BURNING, AS CONDITIONS COULD EASILY SUPPORT
WILDFIRE IGNITION AND RAPID SPREAD.
PRZ014-250800-
SOUTHEAST COASTAL PLAINS-
330 PM AST MON AUG 24 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 0 50 20 40
TEMP (24H TREND) 76 (-2) 93 (+1) 76 94
RH % (24H TREND) 87 (+3) 49 (-4) 87 45
WIND 20FT/EARLY(MPH) E 13 E 14 E 12 E 14
WIND 20FT/LATE(MPH) NE 10 SE 16 E 12 E 19
MIXING HGT(FT-AGL/MSL) 4850 5360
TRANSPORT WND (MPH) E 17 E 16
VENT RATE (KT-FT) 72750 75040
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ015-250800-
SOUTHERN HILLS-
330 PM AST MON AUG 24 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE NONE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 0 60 20 50
TEMP (24H TREND) 72 (-3) 91 (+3) 72 92
RH % (24H TREND) 96 (+3) 58 (-5) 97 53
WIND 20FT/EARLY(MPH) E 12 E 11 E 10 E 11
WIND 20FT/LATE(MPH) NE 12 SE 12 E 11 E 13
MIXING HGT(FT-AGL/MSL) 5840 6080
TRANSPORT WND (MPH) E 16 E 14
VENT RATE (KT-FT) 81760 72960
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ016-250800-
NORTH COASTAL PLAINS-
330 PM AST MON AUG 24 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 50 30 10
TEMP (24H TREND) 76 (-2) 93 (+1) 75 93
RH % (24H TREND) 96 (+3) 60 (-5) 96 58
WIND 20FT/EARLY(MPH) E 16 E 12 E 13 E 12
WIND 20FT/LATE(MPH) E 12 E 19 E 11 NE 19
MIXING HGT(FT-AGL/MSL) 5050 4800
TRANSPORT WND (MPH) E 15 E 15
VENT RATE (KT-FT) 65650 62400
DISPERSION 5 5
DSI 5 6 5 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ017-250800-
NORTHERN HILLS-
330 PM AST MON AUG 24 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE NONE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 0 70 30 30
TEMP (24H TREND) 73 (-2) 92 (+2) 73 91
RH % (24H TREND) 97 (+1) 64 (-1) 98 61
WIND 20FT/EARLY(MPH) E 12 E 11 E 11 E 11
WIND 20FT/LATE(MPH) E 10 E 16 E 8 NE 17
MIXING HGT(FT-AGL/MSL) 6370 5760
TRANSPORT WND (MPH) E 13 E 12
VENT RATE (KT-FT) 70070 57600
DISPERSION 5 5
DSI 4 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ018-250800-
WEST COAST-
330 PM AST MON AUG 24 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE NONE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 0 50 20 60
TEMP (24H TREND) 74 (-2) 94 (+1) 74 94
RH % (24H TREND) 97 (+1) 60 (-4) 97 58
WIND 20FT/EARLY(MPH) E 11 E 12 E 10 E 11
WIND 20FT/LATE(MPH) E 10 E 13 E 11 E 14
MIXING HGT(FT-AGL/MSL) 4540 4720
TRANSPORT WND (MPH) SE 10 E 7
VENT RATE (KT-FT) 40860 28320
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ019-250800-
EASTERN INTERIOR-
330 PM AST MON AUG 24 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 50 30 10
TEMP (24H TREND) 74 (-3) 92 (+2) 74 92
RH % (24H TREND) 97 (+4) 59 (-3) 97 55
WIND 20FT/EARLY(MPH) E 13 E 12 E 11 E 11
WIND 20FT/LATE(MPH) E 12 E 13 E 12 E 13
MIXING HGT(FT-AGL/MSL) 6170 6810
TRANSPORT WND (MPH) SE 16 E 14
VENT RATE (KT-FT) 86380 81720
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ022-250800-
LUQUILLO MOUNTAIN RANGE-
330 PM AST MON AUG 24 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY MCLEAR CLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS NONE
CHANCE PRECIP (%) 40 50 30 0
TEMP (24H TREND) 71 (-3) 87 (+4) 71 88
RH % (24H TREND) 100 (+4) 67 (-6) 99 63
WIND 20FT/EARLY(MPH) E 10 E 10 E 9 E 10
WIND 20FT/LATE(MPH) E 10 SE 10 E 10 E 11
MIXING HGT(FT-AGL/MSL) 3540 4620
TRANSPORT WND (MPH) SE 16 E 15
VENT RATE (KT-FT) 49560 60060
DISPERSION 5 5
DSI 5 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ023-250800-
CENTRAL MOUNTAIN RANGE-
330 PM AST MON AUG 24 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER CLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE NONE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 0 70 20 60
TEMP (24H TREND) 70 (-3) 89 (+4) 70 90
RH % (24H TREND) 99 (+2) 66 (-4) 99 62
WIND 20FT/EARLY(MPH) E 8 E 9 E 8 E 8
WIND 20FT/LATE(MPH) E 8 E 10 E 6 E 11
MIXING HGT(FT-AGL/MSL) 7360 7810
TRANSPORT WND (MPH) SE 13 E 9
VENT RATE (KT-FT) 80960 62480
DISPERSION 5 5
DSI 2 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ024-250800-
CAYEY MOUNTAIN RANGE-
330 PM AST MON AUG 24 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 40 30 0
TEMP (24H TREND) 72 (-2) 87 (+2) 73 88
RH % (24H TREND) 99 (+1) 66 (-1) 99 60
WIND 20FT/EARLY(MPH) E 10 E 10 E 9 E 11
WIND 20FT/LATE(MPH) E 9 SE 11 E 10 E 11
MIXING HGT(FT-AGL/MSL) 4540 5400
TRANSPORT WND (MPH) SE 17 E 15
VENT RATE (KT-FT) 68100 70200
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ025-250800-
VIEQUES-
330 PM AST MON AUG 24 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY MCLEAR MCLEAR
PRECIP TYPE TSTMS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 50 30 10
TEMP (24H TREND) 79 (-2) 91 (+1) 80 91
RH % (24H TREND) 86 (+3) 58 (-4) 84 58
WIND 20FT/EARLY(MPH) E 17 E 16 E 16 E 13
WIND 20FT/LATE(MPH) E 17 E 13 E 16 NE 13
MIXING HGT(FT-AGL/MSL) 2760 3500
TRANSPORT WND (MPH) E 16 E 16
VENT RATE (KT-FT) 38640 49000
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ026-250800-
CULEBRA-
330 PM AST MON AUG 24 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY MCLEAR MCLEAR
PRECIP TYPE TSTMS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 50 30 20
TEMP (24H TREND) 79 (-2) 92 (+2) 80 92
RH % (24H TREND) 91 (+4) 61 (-6) 88 59
WIND 20FT/EARLY(MPH) E 17 E 16 E 16 E 13
WIND 20FT/LATE(MPH) E 16 E 13 E 16 NE 13
MIXING HGT(FT-AGL/MSL) 2720 3440
TRANSPORT WND (MPH) E 20 E 15
VENT RATE (KT-FT) 46240 44720
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ027-250800-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 PM AST MON AUG 24 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 0 30 20 40
TEMP (24H TREND) 75 (-3) 94 (+2) 76 94
RH % (24H TREND) 89 (+2) 50 (-6) 91 46
WIND 20FT/EARLY(MPH) E 13 E 17 E 14 E 16
WIND 20FT/LATE(MPH) E 12 SE 19 E 14 SE 17
MIXING HGT(FT-AGL/MSL) 4770 5070
TRANSPORT WND (MPH) E 20 E 14
VENT RATE (KT-FT) 81090 60840
DISPERSION 5 5
DSI 3 6 5 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ001-250800-
SAINT THOMAS AND SAINT JOHN-
330 PM AST MON AUG 24 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER PCLDY PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 40 30 20
TEMP (24H TREND) 77 (-4) 90 (+2) 79 89
RH % (24H TREND) 93 (+7) 62 (-5) 89 61
WIND 20FT/EARLY(MPH) E 17 E 14 E 17 E 13
WIND 20FT/LATE(MPH) E 17 E 13 E 17 NE 13
MIXING HGT(FT-AGL/MSL) 2810 3320
TRANSPORT WND (MPH) SE 20 E 16
VENT RATE (KT-FT) 47770 46480
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ002-250800-
ST CROIX-
330 PM AST MON AUG 24 2026
TONIGHT TUE TUE NIGHT WED
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 40 20 20
TEMP (24H TREND) 78 (-3) 91 (+2) 79 91
RH % (24H TREND) 92 (+5) 64 (-4) 87 63
WIND 20FT/EARLY(MPH) E 16 E 14 E 16 E 13
WIND 20FT/LATE(MPH) E 16 E 14 E 16 NE 14
MIXING HGT(FT-AGL/MSL) 4530 4690
TRANSPORT WND (MPH) SE 20 E 17
VENT RATE (KT-FT) 77010 70350
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
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